Prime Earth, otherwise known as the Stephen King Universe, is considered to be the shared universe in which almost all stories by author Stephen King take place. Most of the stories take place in Maine.

The book The Complete Stephen King Universe: A Guide to the Worlds of Stephen King dubbed this shared universe as "The Prime Reality".

Despite the many connections between King's works (especially with The Dark Tower), this universe's official existence is still a mystery, but it exists across the edge of Keystone Earth and All-World, possibly acting as the third nexus of reality.

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